Skip to main content

Ozone Hourly Averages

Ozone is a form of oxygen with three atoms instead of the usual two atoms. It is a photochemical oxidant and, at ground level, is the main component of smog. Unlike other gaseous pollutants, ozone is not emitted directly into the atmosphere. Instead, it is created in the atmosphere by the action of sunlight on volatile organic compounds and nitrogen oxides.

In Texas, higher levels of ozone usually occur on sunny days with light winds, primarily from March through October. An ozone exceedance day is counted if the measured eight-hour average ozone concentration exceeds the standards.

Use the controls below to select a different date or parameter. Click on the Generate Report button once you have made your selections.

Click on the Plot Data button once the tabular report has been generated to open a separate window containing data plots.
Select a date: Time Format: Select a Parameter:
Highlight validated data (Validated data has been manually reviewed by a data validator)
Select a Region:

Ozone Hourly Averages for Thursday, March 23, 2023.
measured in parts per billion
Mid 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:0010:0011:00Noon 1:00 2:00 3:00 4:00 5:00 6:00
Dallas-Fort Worth - all times are in CST
13 292826262522212123263033 PMA3938373638 NA 13 2 R MDL TCEQ
17 252524232220141517202529323535343332 NA 17 2 R MDL TCEQ
31 282625252421191818232933373939383736 NA 31 1 R MDL TCEQ
56 282724222120181820212431374041403736 NA 56 1 R MDL TCEQ
61 252422191918181921232831 QAS QAS QAS353432 NA 61 1 R MDL TCEQ
63 262524232220191820242931343636363635 NA 63 1 R MDL TCEQ
69  1 272624232219171317232729313334353534 NA 69  1 1 R MDL Other Gov
70 2724212118161312192329323437363533 FEW NA 70 1 R MDL TCEQ
71 282827262318171821253034363838393838 NA 71 1 R MDL TCEQ
73 252625232119171719222730323434333334 NA 73 1 R MDL TCEQ
75  2 272624222121212021222631343839383636 NA 75  2 1 R MDL TCEQ
76 262526242321161717182428313233323231 NA 76 1 R MDL TCEQ
77 252423232221191920242831343435343535 NA 77 1 R MDL TCEQ
401  3 242321211917151217212426293132323332 NA 401  3 3 R MDL Other Gov
402  1 272525252321191922232528313233353433 NA 402  1 1 R MDL Other Gov
1006 363633282826242326323537394143444442 NA 1006 1 R MDL TCEQ
1032 272625242120171618222529384041403836 NA 1032 1 R MDL TCEQ
1044 272524232321202024283032343536363535 NA 1044 1 R MDL TCEQ
1051 2828272624242323 SPZ283133353638383734 NA 1051 1 R MDL TCEQ
- These sites are maintained and operated by the City of Dallas.
- These sites are maintained and operated by AECOM for North Texas Commission (NTC).
- These sites are maintained and operated by the City of Dallas (Met NOx O3 SO2 CO).

TCEQ does not certify the validity or quality of data it hosts from other monitoring entities.
Maximum values for the day are bold within the table. Minimum values are bold italic.
 R - Data from this instrument meets EPA quality assurance criteria for regulatory purposes.

PLEASE NOTE:  This data has not been verified by the TCEQ and may change. This is the most current data, but it is not official until it has been certified by our technical staff. Data is collected from TCEQ ambient monitoring sites and may include data collected by other outside agencies. This data is updated hourly. All times shown are in local standard time unless otherwise indicated.

Following EPA reporting guidelines, negative values may be displayed in our hourly criteria air quality data, down to the negative of the EPA listed Method Detection Limit (MDL) for the particular instrument that made the measurements. The reported concentrations can be negative due to zero drift in the electronic instrument output, data logger channel, or calibration adjustments to the data. Prior to 1/1/2013, slightly negative values were automatically set to zero.